Udimet 720 Li材料B-P型粘塑性本构建模研究  

B-P viscoplastic constitutive modeling of Udimet 720 Li

作　　者：石多奇[1] 杨晓光[1] 王延荣[1] 周燕佩[1] 

机构地区：[1]北京航空航天大学能源与动力工程学院,北京100083

出　　处：《北京航空航天大学学报》2003年第7期627-630,共4页Journal of Beijing University of Aeronautics and Astronautics

基　　金：欧盟FP5框架E3EDiscLifing(中德Jet)基金资助项目

摘　　要：针对航空发动机用涡轮盘材料Udimet72 0Li,根据高温单轴实验结果 ,对其在各种载荷条件下的力学行为 ,开展了采用Bodner Partom(B P)统一型弹 粘塑性本构方程进行建模的研究 .充分讨论了基于内变量理论的该型本构模型对率相关拉伸、循环硬化及蠕变等力学行为同时进行建模的能力 ;根据对模型的本构分析 ,给出了一种分类加整体考虑的模型参数优化策略 .通过ABAQUS用户子程序 ,把该模型结合进了有限元方法 ,并进行了计算验证 .研究表明B P本构模型可较好地建模高温镍基合金Udimet72Udimet 720 Li is a Ni-based superalloy used for aeroengine disc. Based on the uniaxial tensile, cyclic loading and creep experiments results at 650°C, the Bodner-Partom unified viscoplastic constitutive theory was applied to model the mechanical behaviors of the material under three different loading conditions. After detailed analysis of constitutive characteristics of B-P model, a global optimized strategy for model parameters was given in order to simulate tensile, cyclic and creep curves simultaneously. The B-P model was implemented in ABAQUS soft ware through UMAT subroutine using a self-adaptive time stepping strategy. The results show that B-P model is able to describe such kinds of mechanical behaviors, but it needs to be modified to model fast isotropic softening and ratcheting.

关 键 词：粘塑性 本构关系 高温合金 

分 类 号：TB125[理学—工程力学]